Description

if no group is specified all cache files will be destroyed ;
else only cache files of the specified group will be destroyed

Parameter

string
$group

name of the cache group

string
$mode

flush cache mode :
'old' (clean too old cache files for the current lifetime),
'ingroup' (clean all cache files for the given group),
'notingroup' (clean all the cache files except for the given group),
[since 1.5.0 beta]
'callback_myFunc'
(call the function 'myFunc' with the complete path file
and the group in parameters, if the callback return 'true',
the cache file is deleted).